diff --git a/.opencode/skills/copilot-prompt-engineering/SKILL.md b/.opencode/skills/copilot-prompt-engineering/SKILL.md
index df36a08..e1c1e76 100644
--- a/.opencode/skills/copilot-prompt-engineering/SKILL.md
+++ b/.opencode/skills/copilot-prompt-engineering/SKILL.md
@@ -28,6 +28,9 @@ Use this skill when the user wants a prompt for another AI assistant, GitHub Cop
 
 ## Fidelity Prompting Rules
 
+- Write the final prompt in English unless the user explicitly requests another language.
+- Default to first-person wording so the user can paste the prompt directly into Copilot.
+- Keep the prompt short unless the user asks for more detail.
 - Include Jira ID and approved title when available.
 - For REST work, say REST is behind a feature flag and GraphQL is fallback unless confirmed otherwise.
 - For XFlow work, say behavior may depend on entry point, auth state, backend config, and consumer integration.
diff --git a/agent-memory/workflows/ai-to-ai-prompting.md b/agent-memory/workflows/ai-to-ai-prompting.md
index 537bbbc..1f0fe1b 100644
--- a/agent-memory/workflows/ai-to-ai-prompting.md
+++ b/agent-memory/workflows/ai-to-ai-prompting.md
@@ -45,6 +45,9 @@ Use this structure by default:
 
 ## Prompt Quality Rules
 
+- Write prompts in English by default for GitHub Copilot and other development-machine AI tools unless the user explicitly asks for another language.
+- Prefer first-person phrasing when drafting a prompt the user will paste directly into another AI tool, unless the user asks for a different voice.
+- Keep prompts concise by default; include only the context needed for correct execution.
 - Prefer precise task framing over long background dumps.
 - Include Jira ID and title when the work maps to a ticket.
 - Include current constraints such as REST feature flag, GraphQL fallback, auth state, backend-driven behavior, and consumer validation when relevant.